Introduction to Operator Theory and Invariant Subspaces book cover

Introduction to Operator Theory and Invariant Subspaces

This monograph only requires of the reader a basic knowledge of classical analysis: measure theory, analytic functions, Hilbert spaces, functional analysis. The book is self-contained, except for a few technical tools, for which precise references are given.Part I starts with finite-dimensional spaces and general spectral theory. But very soon (Chapter III), new material is presented, leading to new directions for research. Open questions are mentioned here. Part II concerns compactness and its applications, not only spectral theory for compact operators (Invariant Subspaces and Lomonossov's Theorem) but also duality between the space of nuclear operators and the space of all operators on a Hilbert space, a result which is seldom presented. Part III contains Algebra Techniques: Gelfand's Theory, and application to Normal Operators. Here again, directions for research are indicated. Part IV deals with analytic functions, and contains a few new developments. A simplified, operator-oriented, version is presented. Part V presents dilations and extensions: Nagy-Foias dilation theory, and the author's work about C1-contractions. Part VI deals with the Invariant Subspace Problem, with positive results and counter-examples.In general, much new material is presented. On the Invariant Subspace Problem, the level of research is reached, both in the positive and negative directions.

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Published: October 1988

Imprint: North-holland

ISBN: 978-0-444-70521-1

Contents

  • I. General Theory. Operators on Finite-Dimensional Spaces. Elementary Spectral Theory. The Orbits of a Linear Operator. II. Compactness and its Applications. Spectral Theory for Compact Operators. Topologies on the Space of Operators. III. Banach Algebras Techniques. Banach Algebras. Normal Operators. IV. Analytic Functions. Banach Spaces of Analytic Functions. The Multiplication by ei&thgr; on H2 (&Pgr;) and L2 (&Pgr;). V. Dilations and Extensions. Minimal Dilation of a Contraction. The H Functional Calculus. C1-Contractions. VI. Invariant Subspaces. Positive Results. A Counter-Example to the Invariant Subspace Problem. Exercises. Index. References.

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